Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Business Segment Information - Schedule Reportable and Operating Segment Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 84,754,837	$ 80,663,532	$ 249,042,769	$ 237,604,265
Operating Segments \| U.S. Healthcare Solutions
Segment Reporting [Line Items]
Revenue	74,860,763	71,342,873	219,837,666	210,717,432
Operating Segments \| International Healthcare Solutions
Segment Reporting [Line Items]
Revenue	7,680,456	7,253,396	22,870,178	20,909,070
Operating Segments \| International Healthcare Solutions \| Alliance Healthcare
Segment Reporting [Line Items]
Revenue	6,601,430	6,229,963	19,648,593	18,001,154
Operating Segments \| International Healthcare Solutions \| Other Healthcare Solutions
Segment Reporting [Line Items]
Revenue	1,079,026	1,023,433	3,221,585	2,907,916
Other
Segment Reporting [Line Items]
Revenue	2,253,330	2,107,464	6,437,848	6,066,326
Other \| Animal Health
Segment Reporting [Line Items]
Revenue	1,519,782	1,471,692	4,426,888	4,214,709
Other \| Other non-strategic businesses
Segment Reporting [Line Items]
Revenue	733,548	635,772	2,010,960	1,851,617
Intersegment eliminations
Segment Reporting [Line Items]
Revenue	$ (39,712)	$ (40,201)	$ (102,923)	$ (88,563)